Grinder



G. C. LEACH Oct. 24, 1950 GRINDER 8 Sheets-Sheet 1 Filed Dec. 6. 1946 G. C. LEACH Oct. 24, 1950 GRINDER 8 Sheets-Sheet 2 Filed Dec. 6, 1946 Elma/who? rlllllll.

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GRINDER Filed Dec. 6, 1946 8 Sheets-Sheet 3 Oct. 24, 1950 G. C. LEACH GRINDER 8 Sheets-Sheet 4 Filed Dec. 6, 1946 C Leaoiz Gbtomw 5 G. C. LEACH Oct. 24, 1950 GRINDER Filed Dec. 6. 1946 Flllllllll 8 Sheets-Sheet G. C. LEACH Oct. 24, 1950 GRINDER 8 SheetsSheet 6 Filed Dec. 6, 1946 aa Lazar G. C. LEACH Oct. 24, 1950 GRINDER 8 Sheets-Sheet 7 Filed Dec. 6, 1946 jwucuton Cid-Leach w W a G. C. LEACH Oct. 24, 1950 GRINDER 8 Sheets-Sheet 8 Filed Dec. 6, 1946 Q6 Leack Z V I l atenteci Oct.

UNITED STATES PATENT OFFICE 7 Claims.

This invention relates to grinding machines and is an improvement over the construction shown in copending application Serial Number 626,407, filed November 2, 1945, for Grinding Machine, now Patent No. 2,479,579, dated August 23, 1949.

An object of this invention is to provide a grinding machine which will sharpen the edge of a plow disc and will form a convex bevel on the edge of the disc.

Another object of this invention is to provide a grinding machine of this kind which will sharpen the edge of a plow disc in such a manner that the edge of the disc will not be burned or unduly heated so that the temper of the disc will be retained.

A further object of this invention is to provide a grinding machine which is designed to sharpen a plurality of discs in one operation.

A further object of this invention is to provide in a machine of this kind an improved means for locking and declutching the disc shaft so that the disc can be readily mounted on and removed from the disc shaft.

A further object of this invention is to provide a grinding machine of this kind wherein the disc is oscillated relative to the grinding wheel so as to form a convex bevel on the edge of the disc, and also to speed up the grinding operation without undue heating of the disc.

A further object of this invention is to provide a grinding machine which is so constructed and arranged that the edges of warped discs can be sharpened without truing up the discs.

With the above and other objects in view, my invention consists in the arrangement, combina tion and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claims.

In the drawings,

Figure 1 is a detail side elevation of a grinding machine constructed according to an embodiment of this invention,

Figure 2 is a sectional view taken substantially on the line 22 of Figure 1,

Figure 3 is a horizontal sectional view taken substantially on the line 33 of Figure 1,

Figure 4 is a sectional view taken substantially on the line 4-4 of Figure 3,

Figure 5 is a fragmentary sectional View taken on the line 5--5 of Figure 1,

Figure 6 is a fragmentary sectional view taken on the line 65 of Figure 5,

Figure 7 is a fragmentary sectional view taken on the line 'l'l of Figure 6,

Figure 8 is a fragmentary sectional view taken on the line 88 of Figure 1,

Figure 9 is a fragmentary vertical section of one of the disc supporting units,

Figure 10 is an enlarged fragmentary sectional view taken substantially on the line |0| [I of Figure 1,

Figure 11 is an enlarged fragmentary sectional view taken on the line i i-l I of Figure 1,

Figure 12 is a sectional view taken on the line i2-|2 of Figure 1,

Figure 13 is a fragmentary sectional view taken substantially on the line l3l3 of Figure 1,

Figure 14 is a fragmentary sectional view taken on the line i4l l of Figure 1,

Figure 15 is a fragmentary sectional view taken on the line l5i 5 of Figure 1,

Figure 18 is a fragmentary sectional view taken on the line lEi-i5 of Figure 10, showing the disc shaft in locked position,

Figure 1'7 is a fragmentary sectional view taken on the line I'il l of Figure 16,

Figure 18 is a fragmentary sectional view showing the manner in which the convex bevel on the disc is formed.

Referring to the drawings, the numeral 20 designates generally a frame structure which is formed of opposite side members generally designated as 2 l, which are connected together by means of transverse connecting bars 2 and 23. Each side member 2! is formed of an upper angle bar 2A and a pair of downwardly divergent supporting legs which may be formed of angle bars. An intermediate angle bar 26 is connected at its upper end to the upper member 24 and is connected at its lower end to a base angle bar 21.

A longitudinal lower side bar 28 is connected between the supporting legs 25 and is also fixed to the intermediate supporting leg 26. The side member 2! also includes a pair of longitudinally curved combined bracing members and guide bars 29 and 36. The purpose for the guide bars 29 and will be hereinafter described. 7

A grinder shaft 3i is journaled in bearings 32 carried by the upper frame bars 24 and the shaft 3! has mounted thereon a pair of pulleys 33 and 34. The pulley 33 is provided as an auxiliary driving means for the grinding shaft 3I, whereby this shaft may be connected with an overhead power means where such power means is available. The pulley 34 has trained thereabout a belt 35 which extends downwardly and is trained about a lower pulley 36 which is fixed on a lower shaft 37. The lower shaft 37 is journaled in bearings 38 which are carried by the lower horizontal bars 28.

The grinder shaft 3| has mounted thereon a pair of abrading wheels 39 which are disposed outside of the fram 29. The shaft 3! is held against endwise movement relative to the bearings 32 by means of collars 49 fixed to the shaft 3! by set screws M on the outer sides of the bearings 32. Each grinding wheel or abrader 39 is held against endwise movement and against rotary movement on the shaft lit by means of inner and outer collars 42 and 43. The inner collar 52 may be locked against rotation by means of a set screw or other fastening means 44, whereas the outer collar 43 is tightly clamped against the outer side of the grinding wheel 39 by means of a nut 45 which is threaded on the outer end of the shaft 3|.

The lower shaft 37 also has fixed thereon a pulley 48 about which a driving belt 4? is trained. The belt 47 is also trained about a motor pulley 49 which is fixed on a motor shaft 49 connected to a motor or power member 59. The motor or power member 59 is disposed at one end of the frame 29, as shown more clearly in Figure 3. A guard is disposed about each grinding wheel 39, being generally designated 55. Each guard is formed of inner and outer walls 52 and 53 (Fig. 5) and an arcuate bottom wall 59. The side walls of the guard are formed with a cutout 55 so that the guard may be raised to the desired, position and at the same time expose the desired amount of grinding wheel surface.

The guard BI has fixed to the lower end thereof a U-shaped clamping member 56 which extends vertically from the bottom wall and is formed with oppositely extending flanges 57. The flanges 57 extend above the U-shaped member 55 and are adapted to engage against the inner side of the inner wall 52, as shown at 59, and ar secured thereto by fastening members 59. The intermediate leg or frame member 26 has fixed thereto an (,i

angle member 69 which has one side thereof extending outwardly and formed with an elongated vertically disposed slot 9i through which a bolt or fastener member 62 engages.

The bolt or fastening member 62 extends through the legs of the clamping member 56 so that the guard may be vertically adjusted and locked in its adjusted position with respect to its associated grinding wheel.

The frame 29 has mounted on the outer sides thereof a plurality of disc supporting members generally designated as 63, 9 5, 65, and 68. These disc supporting and rotating means are identical as to the details of their construction and the detailed description of one of these disc supporting members will apply equally as well to the other members.

The disc supporting member 63 comprises a pair of parallel bars 67 and 68 (Fig. 2) which are connected together at the lower ends by a bushing 99. The bushing 69 is rockably mounted on a horizontal shaft 79 which is journaled in bearings 7i carried by the lower horizontal bars 28. The bushing 99 is loose on the outer end of the shaft 7950 that this shaft can have rotation inde endent of the movement of rocking of the arms 67 and 68, and the bushing 69. Arm 67 has fixed thereto by fastening members 72, an upwardly extending arm or lever 73 formed adjacent the uppe end portion thereof with an outwardly offset portion 74. Arm or lever 63 has fixed thereto by fastening members 75 an upwardly extending arm or lever 76.

A gear housing 77 is disposed between the upper ends of the lever members 74 and 76 and is adapted to have rocking movement between the lever arms or members 74 and 76 as will be hereinafter described. The housing 77, shown more clearly in Figures 19 and 11, has fixed to the outer side wall 79 thereof a trunnion or stub shaft 79. This trunnion or stub shaft 79 rockably engages through an opening 89 formed in the arm or lever extension 74. A second stub shaft 3| is journaled through a bushing 82 which is fixed to the lever member 76 and extends through the inner side wall 83 of the housing 77.

A beveled gear 8 5 is fixed on the outer end of the stub shaft 8|. The inner wall 83 may be formed with a bearing boss 85 on the outer side thereof and a second bearing boss 96, formed with a flange 87 is secured by fastening members 88 to the inner side of the inner wal1 93. The shaft 8| rotatably engages through the bearing bosses 85 and 96. The shaft 8! has fixed thereto a pulle 89 about which a belt 99 is trained. The belt 99 is also trained about a lower pulley 9i which is fixed on the shaft 79.

The belt 99 is maintained taut by means of an idler pulley 9?. which is carried by a crank 93 and the crank 93 is journaled through a pair of lugs 94 which ar fixed to the lever members 13 and 76. The crank 93 includes a crank handle which may be locked in inoperative position by engagement with a notched keeper 9'5 which is fixed to and extends from the lever or arm 67.

A disc rotating shaft 97 is journaled through upper and lower bearings 98 and 99, carried by the upper and lower walls I99 and NI of the housing 77. The shaft 97 is formed with a longitudinally extending keyway I92 and a beveled gear I93 is mounted on the shaft 97, having a boss I94 which includes a key I 95 slidably engaging in the keyway I92. In this manner the gear I93 may be moved lengthwise of the shaft 97.

Gear !93 meshes with gear 84 and gear I93 may be moved endwise on the shaft 97 by means of a sleeve I95 loosely engaging about the shaft 97 below the gear I93. The sleeve I95 engages between a shifting fork I96 which is rockably mounted on a pair of ears I97 which are fixed to the rear wall I98 of the housing 77. The arms of the fork I 95 are rockably secured to the sleeve I95 by means of pivot members I99 which are fixed to the sleeve I95. The fork I96 includes an outwardly extending arm II9 which is formed with a beveled upper edge III. The arm I I9 also includes, as shown in Figure 1, substantially L-shaped lever II2 by means of which the fork I96 may be raised or lowered. When the fork I96 is in its raised position to thereby disengage ear I93 from gear 84, arm II9 will engage between a pair of teeth on the gear I93, as shown in Figures 16 and 17, so as to thereby lock gear I93 in its disengaged position from rotation and also lock disc shaft 9'! against rotation. This locking of shaft 97 is provided in order that a disc may be readily mounted on or removed from the upper end of shaft 97.

The disc shaft 97 extends above the bearing 98 and has mounted thereon adjacent the upper end thereof a cup-shaped disc support I I3 formed with a peripheral flange H4. A plow disc H5 is adapted to engage the cup-shaped support H3 and preferably a cushioning member H6 is interposed between the convex lower side of the plow disc H5 and the flange H4. The disc H5 is tightly clamped on the support H3 by means of a nut I I1 carried by a hand wheel I I8 and the disc H5 is adapted to be centered with respect to the shaft 91 by means of a cone-shaped centering member I I 9 which will engage in the center hole of the disc I I5.

In order to prevent undue noise or vibration of the peripheral edge of the disc when the latter is in engagement with the grinding wheel 39, I have provided a dished plate I29 which has mounted on the peripheral edge thereof cushioning member I2I. The dished member I26 is adapted to be tightly engaged within the concave side of the plow disc H5 by means of a nut I22 which engages a centering cone I23 adapted to engage in the center hole of the dished member I29. The upper end of the bearing 98 is pro= tected against the entrance of any abrading ma terial by means of a cone-shaped guard or shield I24 disposed loosely about the shaft 91, as shown more clearly in Figure 9.

The L-shaped lever H2 is adapted to be held in either clutching or declutching position by means of a notched keeper I24 which is fixed to arms therefor when the plow disc is in inoperative position, by means of an elongated lever I25 which at its inner end is fixed on the stub shaft 19.

The lever or arm I25 is longitudinall curved, as shown in Figure l, and has extending upward- 1y from an intermediate point a pair of bars or plates I26 which engage on the opposite sides of an elongated bar I21 pivotally mounted, as at I29, on the upper end of the lever extension 14.

A clamping bolt I29 extends through the ears or plates I26 and a nut I 39 is threaded on the bolt I29 so that the shaft 91 may be locked in the desired upright position for mounting or removing a plow disc from the shaft, When the plow disc is being ground nut I39 is loosened so that the peripheral edge of the plow disc will loosely engage the grinding wheel 39. A spring I 3! is connected at its upper end to an ear I32 carried by the housing 11 and is connected at its lower end to a hook-shaped tensioning bolt I33 which engages through an arm I34 fixed to the bushing 69. In this manner the shaft 91 will be spring-pressed to hold the edge of the plow disc against the grinding wheel, but if the plow disc should be warped the disc may have undulating motion in order that the entire warped portions of the disc at the peripheral edge thereof will be sharpened in a proper manner.

In order to provide for the formation of a convex bevel at the'peripheral. edges of the disc, which convex bevel i designated in Figure 16 by the numeral I35, I have provided an oscillating means for oscillating or rocking the disc supporting unit as the disc shaft 91 is being rotated.

This oscillation is accomplished by means of an wardly extending bearing upporting plates I49 fixed to the lower horizontal bars 28. The shaft I38 has fixed thereon a pulley I4I about which a belt I42 is trained, and the belt I42 is trained about a small driving pulley I43 mounted on a shaft I44. The shaft I44 has a large gear I45 fixed thereon which meshes with a small gear I46 carried by a shaft I41. The shaft I41 is journaled through a pair of bearings I48 carried by the lower horizontal bars 28.

Shaft I41 has fixed thereon a pulley I49 about which a belt I59 is trained, and the belt I59 is also trained about a small driving pulley I5I mounted on the shaft 31.

In order to maintain the belt I42 taut, I have provided an idler pulley I52 which is rotatably carried by a rock lever I53. The lever I53 is spring-pressed upwardly to belt tightening position by means of a spring I 54. The outer end of the link or pitman I36 is adapted to be adjustably clamped to a rock lever I55 by means of a par of clamping bars I 56. The clamping bars I56 '(Fig. 15) are pivotally mounted on a bolt I51 extending through the outer end of the pitman I39, and the outer ends of the bars I56 are adapted to be clamped to the lever I55 by means of a clamping bolt I58 having a nut I59 threaded thereon.

Rock lever I55 is pivotally mounted on a pivot member I69 carried by an ear I6! extending from the adjacent frame supporting leg 25 and the upper end of lever I55 has rockably mounted thereon a stub shaft I62 engaging through a bushing I63 which is fixed on the lever I55. The shaft I62 includes a bushing I64 through which a screw shaft I65 rotatably engages and the shaft I65 is threaded through a nut I66 rockably carried by a stub shaft I61. The stub shaft I61 loosely engages through a bushing I68 which is carried by the upper end and extends inwardly from the lever 16. The shaft I65 has fixed thereon at its outer end a hand wheel I69 and the shaft I65 is protected against falling abrad-. ing material by means of a shield or guard I19. The shield or guard I19 may be of substantially L-shape in transverse section and the inner end of the guard I19 has a bearing block I1I fixed thereto within which the inner end of the screw shaft I65 rotatably engages. Adjustment of the screw shaft I65 will adjust the angular position of the levers comprising the unit 63 and which include the levers 61, 69, 13, 14 and 16.

The crank 93 which carries the belt tensioning idler 92 is constantly urged to operative position by means of a spring I12 which is secured at one end to an arm I16 carried by the inner lever 16 and is secured at the other end to an arm I14 extending angularly from the upper end of the crank member 93. The associated member 64 of the pair of disc supporting units 63 and 64 is oscillated in unison with the oscillation of unit 66 by means of a short pitman I15 which is connected at its inner end to the crank pin I31. In order to hold the levers 13 and 16 against lateral movement during the oscillation thereof, the upper end of lever 16 has an L-shaped flange I16 secured thereto which loosely engages on the inner side of guide member 39. The inner side of the lever 16 is adapted to engage the outer side of guide member 39 so that the unit is firmly held at its upper free end against lateral movement, particularly during the oscillation thereof.

In the use and operation of this machine, the plow disc I I5 is clamped by means of the clamping nut I I1 on the upper end of shaft 91. At

this time shaft 91 may be disposed in substantially vertical position, as shown in Figure 1, and clutch lever II2 will be disposed in the raised position shown in Figure 16, when the gear I03 is raised to a disengaged position with respect to gear 84. Locking member III will be engaged between a pair of teeth on gear I03 so that shaft 91 will be firmly locked against rotation. When lever H2 is latched in its gear disengaging position, the remaining units of this machine may be operated due to the fact that gear 84 may continue to operate. When clutch lever H2 is lowered, gear IE3 is moved downwardly by means of a U-shaped gear shift member [11 which is fixed to the upper end of sleeve I05.

After the plow disc has been clamped to the upper end of shaft 91, lever I25 is released from lever I21 and screw shaft I65 is turned so as to swing the levers 6'1, 68, i3 and I6 inwardly on the desired angle so that the peripheral edge of the disc will engage the grinding wheel 39. The oscillating link I36 which rocks the levers 61, 58, 13 and I6 is adjusted by adjusting the clamping bars I56 relative to the lever I55 so that the desired length of bevel will be ground on the edge of the disc.

When lever I25 is released from bar I21, spring I 3I will swing housing Ti downwardly and inwardly to yieldably hold the edge of the disc against the abrading wheel. Shaft 3|, upon rotation thereof with the driving connections to the power member, will rotate the grinding wheels and as these wheels rotate shaft 9'! will be rotated so as to rotate the peripheral edge of the plow disc IE across the cutting face of the grinding wheel 39. As the grinding operation is taking place, pulley MI will rotate shaft I38 so as to reciprocate pitman I36, and the reciprocation of this pitman will rock lever I55 and the rocking of lever I55 will effect rocking of levers 61, 63, E3 and I5. Inasmuch as the disc shaft is rockably mounted on the upper ends of levers 14 and 76, being constantly urged downwardly and inwardly by spring ii, the plow disc will be given an upward anddnward movement relative to the abrading surface of wheel 39 in order that the bevel formed on the edge of the disc will be a convex bevel as shown at I35 in Figure 18.

With a machine as hereinbefore described, a

pair of plow discs may be sharpened at one time by the same grinding wheel and it will, of course, be understood that the pairs of disc supporting members may be duplicated as may be desired so that any number of units may be mounted in the same frame. In the drawings there are disclosed two units, each comprising a pair of plow disc supporting members, so that, as herein disclosed, four plow discs may be simultaneously sharpened by this machine. By roviding a machine as hereinbefore described, and particularly by providing for the rocking of the disc as it is being sharpened and rotated, the edge of the disc will not become unduly heated so that the temper of the disc will not become injured during the sharpening thereof. Due to the rotation of the plow disc as it is being sharpened, the edge will be quickly sharpened and in the event the disc is warped at any point, the grinding wheel will not have the effect of truing up the disc due to the rockable mounting of the disc shaft on the oscillating lever construction.

I do not mean to confine myself to the exact details of construction herein disclosed, but claim all variations falling within the purview of the appended claims.

What I claim is:

l. A grinding machine comprising a frame, an abrading wheel rotatably carried by said frame, a lever structure rockably carried by said frame, an article supporting shaft, means rotatably and swingably mounting said shaft on said lever structure, spring means constantly urging said means to rock toward said wheel, and means rotating said shaft and means operatively connected with said shaft rotating means for oscillating said lever structure.

2. A grinding machine comprising a frame, an abrading wheel rotatably carried by said frame, a lever structure rockably carried by said frame, an article supporting shaft, means rotatably and swingably mounting said shaft on said lever structure, spring means constantly urging said means to rock toward said wheel, means rotating said shaft, and means operably connected with said rotating means for oscillating said lever structure.

3. A grinding machine comprising a frame, an abrading wheel rotatably carried by said frame, a lever structure rockably carried by said frame, an article supporting shaft, means carried by said lever structure rotating said shaft, means swingably mounting said shaft on said lever structure, means for rocking said lever structure simultaneous with rotation of said shaft rotating means, means securing an article on said shaft, and spring means biasing said shaft for engaging the article with said abrading wheel.

4-. A grinding machine comprising a frame, an abrading wheel rotatably carried by said frame, a lever structure rockably carried by said frame, an article supporting shaft, means carried by said lever structure rotating said shaft, means swingably unting said shaft on said lever structure, means for rocking said lever structure simultaneous with rotation of said shaft rotating means, means securing an article on said shaft, spring means biasing said shaft for engaging the article with said abrading Wheel, and means locking said shaft against swing on said lever structure.

5. A grinding machine comprising a frame, an abrading wheel rotatably carried by said frame, a lever structure rockably carried at the lower end thereof by said frame, an article supporting shaft, means rotatably and swingably mounting said shaft on the upper portion of said lever structure, spring means constantly urging said first named means to rock toward said wheel, and means operatively connected to said shaft mounting means for rotating said shaft and simultaneously oscillating said lever structure, said latter means including means for selectively disconnecting said shaft from said rotating means and locking said shaft against rotation.

6. A grinding machine comprising a frame, an abrading wheel rotatably carried by said frame, a lever structure rockably carried by said frame, an article supporting shaft, means rotatably and swingably mounting said shaft on said lever structure, spring means constantly urging said means to rock toward said wheel, power actuated means connected with said rotating means and said lever structure for oscillating said lever structure, and means for varying the oscillation of said-lever structure.

7. A grinding machine comprising a frame, an abrading wheel rotatably carried by said frame, a lever structure rockably carried by said frame, an article supporting shaft, means rotatably and swingably mounting said shaft on said lever structure, spring means constantly urging said means to rock toward said wheel, means carried by said frame and said lever structure rotating said shaft and simultaneously oscillating said lever structure, and means securing an article on said shaft in a manner whereby the article will be held against vibration.

GROVER C. LEACH.

REFERENCES CITED Number 10 UNITED STATES PATENTS Name Date Fields Aug. 6, 1907 McCanghey Sept. 19, 1911 Kelley Apr. 18, 1916 Ames Oct. 16, 1917 McClun Mar. 12, 1918 Hansen Nov. 21, 1922 Krug May 5, 1931 Sellberg et a1. Sept. 26, 1933 Turnquist July 21, 1936 Fender July 7, 1942 

